12515823 has 8 divisors (see below), whose sum is σ = 18542000. Its totient is φ = 8343864.

The previous prime is 12515807. The next prime is 12515827. The reversal of 12515823 is 32851521.

It is a happy number.

It is not a de Polignac number, because 12515823 - 2⁴ = 12515807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 463549 = 12515823 / (1 + 2 + 5 + 1 + 5 + 8 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12515827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231748 + ... + 231801.

It is an arithmetic number, because the mean of its divisors is an integer number (2317750).

Almost surely, 2^12515823 is an apocalyptic number.

12515823 is a deficient number, since it is larger than the sum of its proper divisors (6026177).

12515823 is an equidigital number, since it uses as much as digits as its factorization.

12515823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463558 (or 463552 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 12515823 is about 3537.7709083546. The cubic root of 12515823 is about 232.1773255373.

The spelling of 12515823 in words is "twelve million, five hundred fifteen thousand, eight hundred twenty-three".